Revert "Add option to export tracing events to ETW."

content/public/common/content_switches.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/public/common/content_switches.h"
 
 namespace switches {
 
 // The number of MSAA samples for canvas2D. Requires MSAA support by GPU to
 // have an effect. 0 disables MSAA.
@@ skipping 969 matching lines @@
 // which enter the kernel. This is only supported on Windows 8 and beyond.
 const char kDisableWin32kRendererLockDown[] =
     "disable-win32k-renderer-lockdown";
 const char kEnableWin32kRendererLockDown[] =
     "enable-win32k-renderer-lockdown";
 
 // DirectWrite FontCache is shared by browser to renderers using shared memory.
 // This switch allows specifying suffix to shared memory section name to avoid
 // clashes between different instances of Chrome.
 const char kFontCacheSharedMemSuffix[] = "font-cache-shared-mem-suffix";
-
-// Enables the exporting of the tracing events to ETW. This is only supported on
-// Windows Vista and later.
-const char kTraceExportEventsToETW[] = "trace-export-events-to-etw";
 #endif
 
 // Enables the use of NPAPI plugins.
 const char kEnableNpapi[]                   = "enable-npapi";
 
 // Don't dump stuff here, follow the same order as the header.
 
 }  // namespace switches